{"id":"CVE-2021-47361","state":"PUBLISHED","title":"mcb: fix error handling in mcb_alloc_bus()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmcb: fix error handling in mcb_alloc_bus()\n\nThere are two bugs:\n1) If ida_simple_get() fails then this code calls put_device(carrier)\n   but we haven't yet called get_device(carrier) and probably that\n   leads to a use after free.\n2) After device_initialize() then we need to use put_device() to\n   release the bus.  This will free the internal resources tied to the\n   device and call mcb_free_bus() which will free the rest.","publishedAt":"2024-05-21T15:03:29.882Z","updatedAt":"2026-05-11T13:53:13.268Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"18d28819809909c3f24bb72183a901c5e332a63d","status":"affected","lessThan":"8a558261fa57a6deefb0925ab1829f698b194aea","versionType":"git"},{"version":"18d28819809909c3f24bb72183a901c5e332a63d","status":"affected","lessThan":"115b07d9f47e3996430b8f2007edd9768e1f807f","versionType":"git"},{"version":"18d28819809909c3f24bb72183a901c5e332a63d","status":"affected","lessThan":"66f74ba9be9daf9c47fface6af3677f602774f6b","versionType":"git"},{"version":"18d28819809909c3f24bb72183a901c5e332a63d","status":"affected","lessThan":"7751f609eadf36b1f53712bae430019c53a16eb0","versionType":"git"},{"version":"18d28819809909c3f24bb72183a901c5e332a63d","status":"affected","lessThan":"91e4ad05bf18322b5921d1a6c9b603f6eb1694f0","versionType":"git"},{"version":"18d28819809909c3f24bb72183a901c5e332a63d","status":"affected","lessThan":"9fc198f415dee070a1de957bb5bf5921d8df3499","versionType":"git"},{"version":"18d28819809909c3f24bb72183a901c5e332a63d","status":"affected","lessThan":"25a1433216489de4abc889910f744e952cb6dbae","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mcb/mcb-core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"4.9.285","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.249","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.209","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.150","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.70","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.9","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mcb/mcb-core.c"]}],"references":["https://git.kernel.org/stable/c/8a558261fa57a6deefb0925ab1829f698b194aea","https://git.kernel.org/stable/c/115b07d9f47e3996430b8f2007edd9768e1f807f","https://git.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6b","https://git.kernel.org/stable/c/7751f609eadf36b1f53712bae430019c53a16eb0","https://git.kernel.org/stable/c/91e4ad05bf18322b5921d1a6c9b603f6eb1694f0","https://git.kernel.org/stable/c/9fc198f415dee070a1de957bb5bf5921d8df3499","https://git.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbae"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47361.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47361","state":"PUBLISHED","datePublished":"2024-05-21T15:03:29.882Z","dateUpdated":"2026-05-11T13:53:13.268Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T14:58:30.809Z"},"containers":{"cna":{"title":"mcb: fix error handling in mcb_alloc_bus()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmcb: fix error handling in mcb_alloc_bus()\n\nThere are two bugs:\n1) If ida_simple_get() fails then this code calls put_device(carrier)\n   but we haven't yet called get_device(carrier) and probably that\n   leads to a use after free.\n2) After device_initialize() then we need to use put_device() to\n   release the bus.  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